I would suggest you watch this movie only *after* the dorama ("Eizouken ni wa Te o Dasu na!" - which is basically the same title as this movie's - only, in Japanese), as you'd miss out on a tremendously witty and funny series otherwise! Nevertheless, the movie can stand by itself, and since the first twenty minutes or so are basically a recap of the drama's most important moments, even those who haven't watched the drama can appreciate the flick.
I normally am a bit wary of movies following dramas, as it's been my experience that most of those can't keep up the original quality and end up being a let down; but it certainly isn't the case of this "Keep Your Hands Off Eizouken!"....quite the opposite, I personally found it even better than the drama itself - which it's quite a feat, given how the drama had already been almost perfect!
A solid script, some great acting, nice music, himalayan-high production value...what's not to like? Perfect 10!